legend doesn't appear on plot

hi every body. I want to plot a simple problem with a legend. but the legend box is empty on plot as the image i have attached

could anybody help me please

p1_visual=[2 9 28 29 38 50]
p1_method=[3 8 26 31 40 51]
p2_visual=[3 10 26 28 28 51]
p2_method=[3 9 25 31 32 51]
X = categorical({'P1','P2'});
X = reordercats(X,{'P1','P2'});
y_visual_ED=([p1_visual(1);p2_visual(1)]);
y_method_ED=([p1_method(1);p2_method(1)]);

figure (1)
plot(X,y_visual_ED,'b--o',X,y_method_ED,'r-*')
ylim([0 60])
xlabel('Patient')
ylabel('Frame Number')
title('End Diastole')
legend('Visual reading','Proposed method')

figure(2)
y_visual_Ra.E=([p1_visual(2);p2_visual(2);p3_visual(2);p4_visual(2);p5_visual(2);P6_visual(2);p7_visual(2);P8_visual(2);P9_visual(2);p10_visual(2)]);
y_method_Ra.E=([p1_method(2);p2_method(2);P3_method(2);p4_method(2);p5_method(2);P6_method(2);p7_method(2);P8_method(2);P9_method(2);p10_method(2)]);
plot(X,y_visual_Ra.E,'b--o',X,y_method_Ra.E,'r-*')
ylim([0 60])
xlabel('Patient')
ylabel('Frame Number')
title('Rapid Ejection')
legend('Visual reading','Proposed method')

[KALYAN ACHARJYA]

Is there?

[talayeh ghodsi]

sorry but why inside the box in my plot is white and empty?

[Walter Roberson]

Which MATLAB version are you using, and which operating system? What is the output of

opengl info

and what shows up for

which legend